I also have a PRS-300.
- Fitting in my pocket was my reason for buying it versus a 6 inch reader. I've had it in short pockets and even jeans pockets (very snug, but will fit). Fits best in loose pants / shorts, as you would expect. Definitely portable.
- I am also an Ubuntu user, and use Calibre to transfer files. There's no need to use the SONY software at all.
- The screen looks very good, imo. In these forums, there's even a hack available to add a clock to the screen and allow for different fonts to be used on EPUB's.
I can't really speak about PDF or DRM, as I use it mainly for non-DRM'd EPUB's with very little graphics in them. I have tried comic books on them converted via Calibre, and it's readable, just barely. I assume DRM is not something you are concerned about, if you are an Ubuntu user. If you do need it, you can also try running a Windows VM to deal with all things DRM.
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